Hovan was fired last year after allegations emerged about the student.

They began exchanging emails when the girl turned 15 and then began an intimate relationship after her 16th birthday, according to the district attorney's office. Hovan often invited the girl to his Chelsea apartment when his fiancee was away.

A neighbor even told police that she had seen the girl hiding on the fire escape after his fiancee came home unexpectedly. But when the neighbor found out about the underage mistress, she went ballistic and called police.

This wasn't Hovan's first alleged tryst with a student. Before teaching at $40,000-a-year Riverdale, he had an affair with a 17-year-old from Westtown School in Pennsylvania. That student even moved to the city with him.